Water Mark?

Hi guys

Can someone please explain to me what the "high water mark" signifies in the
output of the "show ip route update-queue" command?

R2#*show ip route update-queue*
IP RIB update queue:
  current queue depth: 0
  high water mark: 2
    encountered: 16:52:11.205 UTC Sun Mar 13 2011
    last cleared: 16:51:54.321 UTC Sun Mar 13 2011

Thanks
Atle

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Received on Sun Mar 13 2011 - 18:51:36 ART